Im trying to undertand this attribute thing, but its not sinking in. I was hoping I would have an option to enter quantity and pricing for each product. It appears I have to make attributes first then add product and apply to it.

I have a few hundred items to add to site all of which can be purchased in varying quantities like 25, 50, 100, 250, etc. Not all products will have same qty option and all will have different pricing.
Is there a way to simply have a drop down or table box shopping pricing the visitor can click on to purchase?

On the one product I added to test, it is also showing out of stock. How can this be overridden as all items will be custom ordered and never out of stock.

Any clarification on this would be greatly appreciated.